Cameco Releases 2012 Sustainable Development Report

All, June 18, 2012

Cameco (TSX:CCO) (NYSE:CCJ) released today its 2012 sustainable development report.

The report measures Cameco's sustainability performance on 31 Global Reporting Initiative (GRI) indicators and four indicators unique to the corporation. The report also describes Cameco's approach to corporate social responsibility and provides examples detailing our performance.

"The key measures of Cameco's success are the safety of our work places, the health of our environment, and the trust and support of our neighbours," said president and CEO Tim Gitzel. "This report shows how Cameco is meeting society's increased expectations for environmentally and socially responsible business practices."

The report includes detailed information on how Cameco:

• Benefits people in local communities from northern Saskatchewan to Western Australia through workforce and business development programs, and community investment.
• Is reducing its environmental footprint through process improvements and reclamation projects.
• Provides safe, healthy, and rewarding workplaces.
• Invests in technical innovation and exploration to ensure long-term financial sustainability.

Cameco's full 2012 sustainable development report can be viewed at cameco.com. An executive summary is available in printed form.

Profile

Cameco, with its head office in Saskatoon, Saskatchewan, is one of the world's largest uranium producers. The company's uranium products are used to generate electricity in nuclear energy plants around the world, providing one of the cleanest sources of energy available today. Cameco's shares trade on the Toronto and New York stock exchanges.

As used in this news release, "Cameco" or the "company" means Cameco Corporation, a Canadian corporation and its subsidiaries and affiliates unless stated otherwise.

Investor inquiries:
Rachelle Girard
(306) 956-6403

Media inquiries:
Rob Gereghty
(306) 956-6190